[asan] split asan_test.cc to speedup parallel build (most important if building with a debug clang, which takes a couple of minutes on this large file with templates). More splits to follow

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@173129 91177308-0d34-0410-b5e6-96231b3b80d8